Abstract:

Recently， common vetch anthracnose caused by Colletotrichum spinaciae has been found in northwest China， causing major losses to seed and forage yields in common vetch crops. Moreover， there have been no efficient chemical or other control measures identified to combat anthracnose in common vetch. This study tested the toxicity of five fungicides on C. spinaciae， using a colony growth inhibition test. It was found that the toxicity ranking of the tested herbicides was difenoconazole-azoxystrobin 32.5%>pyraclostrobin 25%>carbendazim 50%>mancozeb 80%>chlorothalonil 75%. Then， compound formulations of the three fungicides with better toxicity were used for a second colony inhibition test. It was found that compound formulations of carbendazim 50%∶pyraclostrobin 25% （1∶2） or carbendazim 50%∶benzozoil 32.5% （2∶1） gave improved control of common vetch anthracnose， compared to treatments with a single fungicide. In addition， field control experiments with the three fungicides showed that the control efficacy of pyraclostrobin 25%， difenoconazole-azoxystrobin 32.5% and carbendazim 50% were 68.88%， 63.50% and 20.62%， respectively. In conclusion， pyraclostrobin 25%， difenoconazole-azoxystrobin 32.5%， pyraclostrobin 25% and carbendazim 50% can effectively control common vetch anthracnose caused by C. spinaciae.

Key words: Vicia sativa, Colletotrichum spinaciae, pyraclostrobin, difenoconazole-azoxystrobin, carbendazim